JP3336002B1 - Collapse method of the fixed ballast ballast - Google Patents

Abstract

An object of the present invention is to provide a method for disintegrating a fixed ballast ballast for the purpose of smoothing the disintegration of a fixed ballast. SOLUTION: The disintegration method of the present invention is characterized in that, when disintegrating a ballast bed fixed with a polyurethane-based fixing agent, an alcohol aqueous solution is sprayed on the surface of the bed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disintegrating a fixed ballast ballast, and more particularly, to a method for disintegrating a ballast ballast laid on a roadbed under a railway line by applying a fixing agent thereto. The present invention relates to the above-described disintegration method for the purpose of performing a specific pre-treatment to smoothly disintegrate the fixed ballast, that is, to facilitate disintegration.

[0002]

2. Description of the Related Art A ballast ballast under a railway line is formed by laying ballast such as crushed stones or gravel on a roadbed. This includes distributing the train load transmitted from the sleepers buried on the floor to the lower roadbed and absorbing the vibration of the running vehicle. However, with the frequency of train passing, ballast wear and ballast splattering due to train load; fluidization and road shoulder collapse due to loosening of the compacted ballast roadbed occur, and these phenomena must be suppressed as much as possible. In order to reduce the number of frequent maintenance inspections, stabilization of a ballast ballast for applying a suitable material to fix a ballast is attempted.

[0003] Generally, a polyurethane-based fixing agent is used as such a fixing material. However, if it becomes necessary to replace a sleeper, adjust a track error, or replace a ballast itself, for example, the fixed ballast roadbed is also replaced with the same. Correspondingly, they had to be removed once, which usually required the use of yumbo (heaving heavy equipment) or pickaxes to break up the ballast. However, since the adhesive is fixed to the ballast, it is difficult to disintegrate the adhesive ballast, and it is impossible to tamper with a hand tie tamper during track maintenance, resulting in noise in the work environment and heavy machinery. It was in the current state of importing and sticking ballast disposal.

[0004] Therefore, in order to smooth the disintegration of the fixed ballast, starch powder is dissolved in warm water to form gelatin, which is sprayed and then coated with heat to soften the fixing agent; 10
Attempts have been made to soften the fixing agent by applying the heat for about a minute, but it takes a long time for the treatment itself, and it cannot be said that this method is advantageous in terms of cost because of the need for a heat source.

[0005]

Means for Solving the Problems The present inventors have made a pretreatment which can make the above-mentioned fixed ballast smooth and decomposable without any environmental pollution and which can be operated relatively easily without any problem in safety for workers. After diligent studies, they found that if an aqueous alcohol solution such as isopropyl alcohol was sprayed before disintegration, the polyurethane-based fixing agent would swell appropriately and the fixed ballast would be easily collapsed, thus completing the present invention. Reached.

That is, the present invention provides a method for disintegrating a fixed ballast ballast, which comprises spraying an aqueous alcohol solution on the surface of the ballast ballast fixed with a polyurethane-based fixing agent. To provide.

The polyurethane-based fixing agent of the present invention includes, for example, those described in Japanese Patent No. 2888643.
An organic polyisocyanate compound (4,4 ′) is added to a polyether polyol containing at least an ethylene oxide portion (a polyether polyol using at least ethylene oxide as an alkylene oxide).
-Diphenylmethane diisocyanate, etc.) and a main agent comprising a terminal isocyanate group-containing urethane prepolymer (comprising appropriate amounts of a bathing agent, a plasticizer, a stabilizer, a colorant, etc., if necessary), and water as a curing agent ( And a curing catalyst such as urea or thiourea, if necessary). In such a fixing agent, a melamine-modified polyether polyol (melamine is dispersed in a polyether polyol) is mixed with a polyether polyol containing at least an ethylene oxide portion, which is a raw material component of the urethane prepolymer having a terminal isocyanate group. Flame retardancy may be imparted by the combined use of a melamine or a melamine added into the polyol molecule in the production process of the polyether polyol.

[0008] In addition to this, Japanese Patent Application Laid-Open No. 2001-1068
No. 99, polyols (polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc.) and polyisocyanates (MDI, TDI
And the like, and an NCO group-containing urethane prepolymer obtained by reacting the NCO group with a solvent such as diethylene glycol dialkyl ether, diethylene glycol diacetate, and diethylene glycol monoalkyl ether acetate.

As the aqueous alcohol solution used in the present invention, any one can be used as long as it can swell the above-mentioned polyurethane-based fixing agent, preferably an alcohol having 2 to 4 carbon atoms, for example, ethyl alcohol, n-propyl alcohol and isopropyl alcohol. Alcohols may be mentioned, and an aqueous solution of at least one of these, usually having an alcohol concentration of 70% or less (% by weight, the same applies hereinafter), preferably 40 to 60% may be used. If the alcohol concentration exceeds 70%, it becomes a hazardous material and is regulated by the Fire Service Law in storage and handling, and particularly preferably 60% or less. If it is less than 40%, it will be absorbed by the fixed ballast roadbed, and the swellability of the polyurethane-based fixing agent tends to decrease.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The method of breaking down a fixed ballast ballast according to the present invention can be carried out according to the following procedure. i) First, an alcohol aqueous solution adjusted to the above-mentioned predetermined alcohol concentration is uniformly sprayed on the surface of a predetermined fixed ballast roadbed. For spraying, for example, a sprinkler or a canister is used (the spray hole is preferably adjusted to a diameter of about 5 mm), and the spraying may be usually performed at an amount of 1 to ³ kg / m ² .
Also, it is preferable to spray a plurality of times.

Ii) Next, immediately after spraying the alcohol aqueous solution (pre-treatment), or immediately or preferably for about 5 to 10 minutes, the ballast fixing agent is swollen and the fixed ballast is disintegrated. Use Yumbo). Here, compared to the case where the pre-processing was omitted, it was popular that it was easily broken. An aqueous alcohol solution is used for the pretreatment.
A A water quality test was conducted according to the Japan Water Works Association Standard, and there was no problem at all.

[0012]

Next, the present invention will be described more specifically with reference to examples (including comparative examples). Example 1 (1) A regular ballast was packed in a 1 L polycup, and the main component of a two-pack polyurethane fixing agent (“Penguin Cement 2090A” manufactured by Sunstar Giken Co., Ltd.) was added at 3 kg / kg.
sprayed in an amount of m ² or 6 kg / ^{m 2,} after about 3 minutes after the curing agent (curing catalyst-containing water) was sprayed in each amount of 1.5 kg / ^{m 2} or 3 kg / ^{m 2} in accordance with the main agent amount Cured for 7 days to form a solid ballast.

Next, an alcohol aqueous solution (ethyl alcohol / n-propyl alcohol / isopropyl alcohol = 46.5: 6: 3,
(Alcohol concentration 59%) in an amount of ² kg / m ² ,
After standing for 10 minutes, take out the ballast body from the poly cup,
First, as a primary evaluation, when a body weight (approximately 70 kg) was applied with only one foot, the composition easily collapsed in both cases of the main agent amounts of 3 kg / m ² and 6 kg / m ² .

(2) As secondary evaluation, the same as (1) above
Ballast fixation and alcohol aqueous solution treatment for 10 minutes
Ballast body left untreated (main agent amount 3 kg / m²And 6 kg
/ M ²), Measurement of uniaxial compressive strength by autograph
(3 times each), and the results are shown in Table 1 below (Al
The results when the aqueous solution of coal is omitted are also shown).
Here, "uniaxial compressive strength" is the amount of force required to break
Means

[0015]

[Table 1] In the results of Table 1, when the amount of the main agent is 6 kg / m ² , there is a tendency to accumulate, and the strength reduction rate is smaller than when the amount is 3 kg / m ² .

(3) As an on-site evaluation, about 20 workers were mobilized at JR West “Okayama Station”, JR West Japan “Suita Station”, and Hankyu “Masajaku Station”, respectively, and the ballast road bed ( 1 month, 6 months, 1 to 3 years after fixation), the same alcohol aqueous solution as above was sprayed, and after standing for 10 minutes, disintegration was performed with a pickaxe or hand tie tamper. Received a favorable reputation from workers for "easy to crumble."

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01B 1/00 E01B 27/04 E01B 37/00

Claims (6)

(57) [Claims] 1. A method for disintegrating a fixed ballast ballast, comprising dispersing an aqueous alcohol solution on the surface of the ballast ballast fixed with a polyurethane-based fixing agent. 2. The disintegration method according to claim 1, wherein the alcohol in the alcohol aqueous solution is at least one of ethyl alcohol, n-propyl alcohol and isopropyl alcohol. 3. An alcohol solution having an alcohol concentration of 7
The disintegration method according to claim 1 or 2, which is 0% by weight or less. 4. An alcohol aqueous solution having an alcohol concentration of 4
The disintegration method according to claim 3, wherein the amount is 0 to 60% by weight. 5. The disintegration method according to claim 1, wherein the ballast fixing agent is swollen by being left after spraying the alcohol aqueous solution. 6. A polyurethane-based fixing agent comprising: a main component comprising a urethane prepolymer having terminal isocyanate groups, obtained by reacting an organic polyisocyanate compound with a polyether polyol containing at least an ethylene oxide portion; and water as a curing agent. The disintegration method according to claim 1, wherein the alcohol in the aqueous alcohol solution is a mixture of ethyl alcohol, n-propyl alcohol and isopropyl alcohol, and the alcohol concentration is 40 to 70% by weight. .